Digital 3D uses polarization instead of color variants to create a 3D effect. Binocular vision is used to combine images in the brain. 3D movies require polarized glasses, while home TVs require a lens. Autostereograms are popular 3D art pieces.
Digital 3D uses polarization to make a 2D image appear three-dimensional. Typically used in movies, polarized glasses are required to see 3D motion, but images can also be viewed without lenses, although they may appear blurry. Digital 3D does not use color shift, which used red, blue and green to create 3D effects in older movies.
Human eyes are binocular. This means that each eye sees a different portion of an image and the two are combined to create an image in the brain. Traditional 3D images are color coded in red and blue. Lenses worn with matching colors allow the eyes to see images that appear to have depth beyond the screen. Using color variants can cause images to appear off-color.
Digital 3D uses many of these concepts, but has replaced color variants with polarization. The images are polarized and wearing glasses with lenses of different polarizations create a 3D effect. Movie theaters typically use one or two projectors to display digital 3D movies on screen. If a projector is used, a switch can be installed to control the polarization of the image. When two projectors are used, images are displayed in both eyes simultaneously.
Digital 3D animation got off to a slow start in movies. Chicken Little was first released in North America in 2005. Digital animation was used to create the film, which was later rendered for 3D viewing. Subsequently, previously released films, such as The Nightmare Before Christmas, Toy Story and Toy Story 2 were re-released as 3D films.
Today, watching 3D movies on home televisions requires the use of 3D glasses. The electronics company Philips was the first to develop a home television capable of displaying digital 3D images without glasses. With it, a lens is placed on the surface of the TV to create a digital 3D effect. However, traditional TV stations or movies tend to appear blurry on this set, and consumers report that images can be distorted from certain angles.
Digital 3D images are also found on the Internet. These images do not use the same 3D technology as movies and television. Usually, they use shadows and motion to trick viewers into seeing what appears to be a 3D image on the screen. Digital art and computer wallpapers are also commonly found in digital 3D.
One of the most popular 3D art pieces is the autostereogram. The images represent a 3D image placed within a 2D artwork. When the eyes are forced out of focus, a second image can usually be seen. Some viewers report feeling the muscles in their eyes twitch as they focus on one of these hidden images.
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